▎ 摘　　要

NOVELTY - Preparing manganese-metal organic frame/graphene oxide nano material comprises e.g. (i) adding graphene oxide into dimethyl sulfoxide, carrying out ultrasonic stripping dispersion treatment, centrifuging, washing, drying and grinding into a primary powder sample; (ii) stirring concentrated acid in primary powder sample, drying and grinding to obtain secondary powder sample; (iii) stirring the secondary powder sample in the N,N-dimethyl formamide to obtain first mixed solution, ultrasonicating manganese acetate tetrahydrate into N,N-dimethyl formamide to obtain the second mixed solution, dissolving 2,5-dihydroxy-terephthalic acid in N,N-dimethyl formamide to obtain third mixed solution, adding second mixed solution into first mixed solution and stirring to obtain fourth mixed solution, dripping third mixed solution and stirring to obtain fifth mixed solution; (iv) heating fifth mixed solution in reaction kettle; and (v) pouring out sample, centrifuging, washing and drying. USE - The method is useful for preparing manganese-metal organic frame/graphene oxide nano material is useful for aqueous zinc ion batteries (claimed). ADVANTAGE - The method: prepares manganese-metal organic frame/graphene oxide nano material exhibits excellent electrochemical performance and can reach a specific discharge capacity of 340.92 mAh/g and utilizes renewable and environmentally-friendly raw materials and has good application prospects in the large-scale energy storage of water-based zinc ion batteries. DETAILED DESCRIPTION - Preparing manganese-metal organic frame/graphene oxide nano material comprises (i) adding the graphene oxide with lower oxidation degree into the dimethyl sulfoxide, performing ultrasonic stripping dispersion treatment, centrifuging, washing, drying in vacuum drying box at 60degrees Celsius and grinding into a primary powder sample; (ii) adding concentrated acid into the primary powder sample in an ice water bath, stirring, centrifuging, washing, drying in 60degrees Celsius vacuum drying box and grinding to obtain secondary powder sample; (iii) adding the secondary powder sample into the N,N-dimethyl formamide and stirring to obtain the first mixed solution, adding the manganese acetate tetrahydrate into N,N-dimethyl formamide and ultrasonicating to accelerate to dissolve to obtain the second mixed solution, adding 2,5-dihydroxy-terephthalic acid into N, N-dimethyl formamide and accelerating ultrasonic to dissolve to obtain the third mixed solution, adding the second mixed solution into the first mixed solution and stirring to obtain the fourth mixed solution, dripping the third mixed solution slowly while stirring into the fourth mixed solution and stirring to obtain the fifth mixed solution; (iv) transferring the fifth mixed solution into the reaction kettle, placing the reaction kettle in the oven for heating and maintaining the temperature; and (v) taking out the reaction kettle, pouring out the sample, centrifuging, washing and drying the sample at 60degrees Celsius in vacuum drying box. INDEPENDENT CLAIMS are also included for: (1) Anode of zinc ion battery comprises manganese-metal organic frame/graphene oxide nano material; (2) Preparing an anode of a zinc ion battery, comprising mixing polyvinylidene fluoride and N-methylpyrrolidone for 10 minutes, adding conductive black carbon slowly, stirring continuously for 30 minutes, adding manganese-metal organic frame/graphene oxide nano material and stirring continuously for 4 hours to form battery anode slurry, where the weight ratio of manganese-metal organic frame/graphene oxide nanomaterials, conductive carbon black and polyvinylidene fluoride is 7:2:1, coating the battery anode slurry uniformly on the titanium foil, drying in a 60degrees Celsius in oven for 1 hour, and cutting into wafer; and (3) Zinc ion battery comprises a zinc ion battery main body comprising anode of zinc ion battery.